> that the correct answer from 2013 is only occasionally still the correct answer in 2018

Exactly! They should have added proper structuring to questions/replies so that it could specifically apply for Language/library version X. Later, such a question could be answered again (either by proving it's still correct for version X+1, or by giving a new answer) - that way people wouldn't have to look at a new reply with 2 votes vs an older, possibly outdated one with 100 and make a decision which to prefer.